Improvement in gas-fixtures



2 Sheets-Sheetl.

J. MCHENRY.

GAS-FIXTURES.

Patented May 30,1876.

N. PETERS. PMoTo-LITHOGRAFHER. WASHINGYON. D C.

. 2 Sheets-Sheet 2.A J'. McHENRY.

GAS-FIXTURES.

Patented May 30,1876.

N.PETERS. PHDTO-LITHDGRAPHER. wAsHmGTON, D C.

.PATENT i FFICE.

JOHN MCHENRY, OF OINOINNATI, OHIO.

IMPROVEMENT IN GAS-FIXTURES.

Specification forming part of Letters Patent No. 178,177, dated May 30, 1876; application filed April 1, 1876.

To all whom it may concern Be it known that I, JOHN MCHENRY, of Cincinnati, Hamilton county, Ohio, have i11- vented a new and useful Gas-Fixture, of which the following is a specification:

My invention consists in sundry improvements in what are known as extension gasaliers or gas-pendants; and comprises va new and useful arrangement of `triple concentric slides or sections, as and for the purposes hereinafter explained.

My invention further comprises a peculiar frictionor brake mechanism, and the combination therewithof a stuffing-box, for the-twofold purpose of preventing the accidental elongationof the xture and of the escape of gas.

My invention further comprises a new and useful gas-regulating device.

My invention further comprises a new and useful joint for sliding or telescope77 fixtures, which operates without oil or grease. n

In the accompanying drawings, Figure l is an axial section (with one brake in elevation)- of a gas-fixture embodying my invention. Fig. 2'is an enlarged axial section, to exhibit more clearly my sliding joint. Fig. 3 is a side elevation, representing an automatic brake for use on a gas-pendant.

A represents a common nipple for attachment of the pipe B to the service-pipe. The pipe B has a customary swellV or ange, b, .around its lower end to prevent its being drawn entirely out of the encircling-tube C C', which is surmounted by a stuffing-box, D, charged with plumbago and a friction-brake. The tube C sattached, by its lower end, to bushing E, which is screwed to the distributer F, having customary screw-threaded apertures in its sides for one or more branches, G, of burners H. Attached to and communicating with the Abushing E is my innermost pipe I, which extends concentrically upward within the tube C O and pipe B to -a height a little above the top ofthe said tube. Surrounding the upper part of the pipe I is a box or magazine, J, to hold powdered graphite or plumbago. This magazine has orifices j near its bottom, to slowly let out the powder in sufficient quantities to keep the joint lubricated without oil or grease of any kind. rBelow the magazine J the pipe I is encircled by a chamber, K, which isfilled with a packing of leather or other customary material. This joint prevents all contact or odorA of gas upon the exposed surface of tube B. A 'conically-pointed screw, L, which occupies a screw-threaded aperture in bottom of distributer, occupies a corresponding conical scat, M, in the distributer, and, by being screwed down or up, operates to either close or open the main passage. This device enables the regulation of the volume or flow of gas to all the burners at once, and secures a proper dame without wastage or blow- 'of the burner above the source of supply, and,

as a consequence, that, while the flame vmay be feeble or inadequate in the lower story or in the valley, it is excessive and liableto blow and waste on the hill-top or upper story. The

device L remedies this defect by enabling the operator to increase or decrease the pressure for one or more burners without incurring the trouble of correcting irregularities by manipulation of the ordinary stop-cock N at every Opening of the burner.

In order .to prevent the accidental elongation of the fixture and to supersede the necessity of making the packing of the stufng-bo'x so tight as to renderit difficult to lengthen or shorten the` fixture, I combine with such box one or more brakes, which may have any suitable construction. My preferred form of brake is shown in Fig. 3. T T are two volute springs attached to the stuffing-box D and bearing two rubbers, U U', whose opposing faces are hollowed to fit and grasp the pipe B. Braces V V', also, fastened to the stuffing-box, press against the springs T T', and, should the latter become ineffective, their efciency can at any time be restored by bending toward each other the braces. Such combination of brake and stuffing box may be used in conjunction with two tubes, as in Fig. 3, or with the compound arrangement of tubes illustrated iu Fig. 1.

By the above-described arrangement of the' stationarypipe B, connected by :the compoundjoint D K with the pair of external and internal pipes U C and I, permanently fastenediat their delivery end, the smell of gas which accompanies the elongation of theiordinary eX-iy tension-fixture is avoided.v Should" any gas" escape past the joint K, it is eiectually confined by the joint D. At thefsameltime the external tube O O, constantly inclosing the slender interior tube I throughout its length, i. constitutes an effectual brace and stiffener,

. thebrake coact to produce the'friction neces j sary to'retain the sliding member securely atl any elevation at which it maybe placed. Tlie.

said brake is preferably appended to and constitutes a part of a short section, G, of the outer slidingrtube G C,=so` as to be conveniently-furnished :to the .trade for:attachmen-t to any suit;- able xtnre for which such a combined fric- ,t tion .-j ointand releasable brake m ay be req uired. A

I claim as new and of my invention- 1. 'Ihe described combination oi' stationary pipe B, connected by a compound joint, D K, with the pair of sliding pipes C I fastened at their deliveryendto a common distributer, in

the manner and for the object designated.

`2. The plumbago-magazine J j, in combination with` a suitable packing or stuffing box 'or chamber, K, below the same, substantially as and for the purpose set forth.

3. The gas body or distributer F, with seat M and screw-valve L, in connection with the stop-.cocks `N and .burners Hf of one or more armsor branches, Gr, forthe'. purpose set forth.n 4. lhieE automatic brakeT T U UVV Vat-` tached to the stuffing-box D,a sy Aandforj-the 1 purpose set forth.' l

In testimony of Which-invention"Lhereunto set'my hand..l J OHN f'lMcHENRYe Y..

Attest:l

GEO. H. KNIGHT, u S. BySPEARL 

